Our full Android Wear hardware and software reviews won't run until next week, but now that we've spent a couple of days with Samsung's Gear Live and LG's G Watch we have a better idea of how these watches are going to look and act.
One thing about both of them sticks out: their software behaves pretty much the same way no matter which device you have. There are small differences that Google has outlined here, but interacting with each watch is exactly the same, and digging down into the settings shows that they're both running the exact same Android versions and build numbers. This would be unusual for Android phones or tablets, which generally come with OEM-controlled UI skins, hardware and software flourishes, and pre-installed apps.
Talking with Google engineering director David Burke confirmed that all of the new Android initiatives announced at the keynote this week—Android Wear, Android Auto, and Android TV—will have user interfaces and underlying software that is controlled by Google, not by the OEMs.